Environmental Engineering Reference
In-Depth Information
P
FRP package
M
Carbon fiber reinforced polymer matrix
composite model.
FIGURE 6.6
Carbon.iber.reinforced.polymer.matrix.composite.model..P.is.an.impulse.load,.M.is.a.bending.
moment.
On.the.level.of.1,000.cpm,.fatigue.stress.must.be.less.than.fatigue.strength.
s.< σ -1 ).
6.3.3 
Temperature Measurement of the Surface of an FRP
By.deining.the.ratio.σ s /E 11 .as.coeficient.K -1 ,.Equation.(6.32).becomes:
.
K -1. =e n (∑Δε 2. -∑α.T).
(6.32)
Table 6.12.and.Table 6.13,.based.on.test.data.from.Phoenixx.TPC, 26 .give.K -1 .
values.for.two.orthogonal.iber.orientations.of.two.FRPs:
Table  6.12:. K -1 . values. of. IM7/PEEK. (Thermo-Lite TM ) . prepreg,. made. from.
carbon. iber. IM7. and. PEEK. polyamide. (40. percent. and. 60. percent. by. vol-
ume,.respectively).
Table 6.13:.K -1 .values.of.IM7/PPS.(Thermo-Lite TM. ) . prepreg,.made.from.car-
bon.iber.IM7.and.polyphenylene.sulide.(PPS).polyamide.(40.percent.and.60.
percent.by.volume,.respectively).
In. Equation. (6.30),. when. n. is. 1,000. cpm,. e n . is. greater. than. 2 1000 ,. making.
K -1 /e n .extremely.small..If.we.set.this.ratio.to.zero,.we.obtain.this.correlation.
between.temperature.gradient.in.Equation.(6.30).and.strain.
TABLE 6.12
Mechanical.Properties.of . IM7.PEEK.(Thermo-Lite TM ) . Prepreg
LaminateProperty
FiberOrientation
TestData
K -1 Ratio
Fatigue.Strength,.s -1. Ksi
O 0
90 0
285
11.2
0.0117
0.086
Tensile.Modulus,.E -11 ,.Msi
O 0
90 0
24.2
1.3
Compression.Strength-Ksi
O 0
136
0.0093
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